A modular shelter comprising a first side wall, first end wall, second side wall, second end wall, first roof section, and a second roof section cut from stock material, such that: (a) the first side wall and the first end wall, the first end wall and the second side wall, the second side wall and the second end wall, and the second end wall and the first side wall are disposed at an angle between 60 and 120 degrees relative to one another and are connected by at least two mortise and tenon joints; and (b) the first roof section and the second roof section are disposed at an angle between 45 and 180 degrees relative to one another and are connected by at least two mortise and tenon joints; wherein the components of the mortise and tenon joints are created using one tool resulting in a novel joint.